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Questions  >>  CBSE XII  >>  Math  >>  Model Papers
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Using properties of determinants, prove that : $ \begin{bmatrix} a^2+2a & 2a+1 & 1 \\ 2a+1 & a+2 & 1 \\ 3 & 3 & 1 \end{bmatrix} = (a-1)^3. $

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